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SG9301 comb signal generator

Brand:

SCHWARZBECK

SG9301 comb signal generator
  • Product Description
  • Main features
  • Technical parameters
    • Commodity name: SG9301 comb signal generator
    • Commodity ID: 1064845732147253248
    • 品牌11: SCHWARZBECK
    • 行业: 民用,汽车电子和整车,军品
    • 品牌: SCHWARZBECK

    　　The Spectrum Generator SG 9301 is a member of the Schwarzbeck pulse generators used worldwide as a pulse standard. Apparently, the IGUF2910S has some similarities. While the latter uses a bounce-free relay contact to discharge the load resistor coaxially, the SG 9301 uses a special avalanche transistor instead of a relay contact.

    　　Transistors cannot switch very high voltages like relays, but on the other hand, advantages such as small profile, position-independent operation and a choice of five pulse frequencies make it very useful.

    　　Unlike the usual calibrated field source generators, which generate a large number of harmonics by extreme driving of nonlinear semiconductors at relatively low supply voltages, avalanche generators use coaxial lines and high constant DC voltages to determine pulse duration and pulse amplitude .

    　　Thanks to this principle, the output spectrum is very constant and has sufficient amplitude even at lower pulse frequencies. Low pulse frequencies must be used when narrowly spaced spectral lines are required to identify narrow-band resonances or notches.

    　　The frequency spectrum can be accurately measured using an EMI receiver.

    　　The measurements are combined with the antenna data and can be used to calculate the field strength. An example of how to calculate field strength is given at the end of this manual.

    　　The built-in Ni-MH battery enables the generator to work for about 10 hours and can be recharged in a short time with the automatic charger ACS 110 traveller. Green LED indicates ready.

    　　To avoid measurement errors due to low battery voltage, the generator will automatically disconnect from the battery before accuracy is compromised. Then the color of the LED will change to red.

  • 　　1: Small, powerful avalanche comb generator that operates without location-independent cables.

    　　2: Easily generate calibrated field strengths by connecting directly to the antenna connector.

    　　3: Pulse frequency 100 Hz, 1 kHz, 10 kHz, 100 kHz and 1 MHz to solve different measurement problems.

    　　4: CISPR 16-1-1 receiver test (F=30 MHz), using 100 Hz pulse frequency, indicating 60 dBµV.

    　　5: Due to the very "tight" spectrum, slow pulse frequencies can even have narrow-band resonances. Fast pulse frequency for strong reception levels even with high site attenuation.

  • Pulse voltage on 50 ohm load

    24V

    Pulse duration

    0.75ns

    Spectrum with a pulse frequency of 1 MHz,

    RMS value (typical value)

    Frequency

    Voltage

    MHz

    dBµV

    1

    95.0

    2

    95.0

    3

    94.2

    5

    92.6

    10

    89.5

    20

    90.3

    30

    90.0

    50

    89.0

    100

    89.0

    200

    88.5

    300

    88.0

    400

    86.3

    500

    84.9

    600

    83.8

    700

    81.3

    800

    79.0

    900

    76.2

    1000

    73.8

     

    Indication on CISPR 16-1-1 band C/D receiver (quasi-peak), FR=30 MHz, pulse frequency 100 Hz

    60dBuV

    shell material

    aluminum alloy

    Connector

    N (f) , 50 ohms

    Dimensions (W×H×D)

    200  x  69  x  41 mm ( body dimensions without connectors, knobs or mounts )

    222  x 69  x 67  mm ( full size )

    weight

    77 0g (including battery)

    Spectrogram:

    　　SG 9301 pulse attenuation 46 dB (division factor: 200)

    　　Calculation example:

    　　Using the SG 9301 and the small biconical antenna UBAA 9114 and BBUK 9139 elements, we want to generate a field (reference Radiation Generator). A free space field strength of 30mhz is required at a distance of 3m. It can be calculated like this:

    　　F [dBµV/m] = -2.2 + gi [dBi] + U [dBµV] - 20 log D [m]

    　　F [dBµV/m]: field strength level

    　　gi [dBi]: isotropic gain of the transmitting antenna

    　　U [dBµV]: Voltage at the antenna input under perfectly matched conditions

    　　D [m]: distance from the transmitting antenna

    　　Using the voltages from the table above at 30MHz and the gain of the antenna (from the datasheet) -38.24 dBi and a distance of 3 meters, we get:

    　　F = -2.2 -38.24 + 90.0 – 9.54

    　　F = 40.02 dBµV/m

    　　Bipyramidal antennas typically have a high VSWR in the lower frequency range. Therefore, the condition of perfect impedance matching does not apply. Standing waves can cause measurement uncertainty. Forcing impedance matching by using an attenuator such as DGA 9552 N 10 dB between the SG 9301 and the antenna can be one way to eliminate standing waves. This is only effective if the resulting field strength shows a sufficient signal-to-noise ratio. The measured field strength should be at least better than the system can improve the distance to the noise floor by using a Tx antenna with better gain (e.g., a larger bipyramid antenna such as VHBB 9124 with BBA 9106 elements). Using this antenna instead of the small UBAA 9114 with BBUK 9139 will result in a higher field strength level of 24dB.

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